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Omega Help Area => Omega General Help => Topic started by: djhorner on 18 February 2013, 23:17:52

Title: misfire and oil in exhaust
Post by: djhorner on 18 February 2013, 23:17:52
limped home today with smoke belching out exhaust and sounding very rough found out rocker cover gaskets had gone and where spark plug is was full of oil any ideas if this could of caused the very smokey exhaust
Title: Re: misfire and oil in exhaust
Post by: Gaffers on 19 February 2013, 07:27:05
oil in the plug wells will cause a misfire, the misfire is sending unburnt fuel in to your hot exhaust creating smoke.

You need to change the rocker cover gaskets, use genuine GM as pattern dont last more than a few months and make sure you clean the breathers.  The latter bing the cause of the blown rocker gaskets :y
Title: Re: misfire and oil in exhaust
Post by: djhorner on 19 February 2013, 21:24:14
changed all gaskets cleaned everything but still smokey and sounding like its not running on all cylinders i think head gasket has gone :(
Title: Re: misfire and oil in exhaust
Post by: dbug on 19 February 2013, 21:29:12
changed all gaskets cleaned everything but still smokey and sounding like its not running on all cylinders i think head gasket has gone :(

Doubt it mate ;)

Will be smoky for a while if oil leaked onto exhaust.

Misfire could well be goosed HT leads if pre f/l or goosed coil pack if f/l due to being cooked in oil ;)
Title: Re: misfire and oil in exhaust
Post by: Gaffers on 19 February 2013, 21:36:30
HG failure quite rare on these cars and it's usually due to abuse of the cooling system with 100% water rather than coolant/water mix.  As sail it's likely to be the HT leads/coil pack due to the oil cooking them.
Title: Re: misfire and oil in exhaust
Post by: djhorner on 19 February 2013, 22:43:28
there is a coolant leak and white smoke out of exhaust and i have changed hbv
Title: Re: misfire and oil in exhaust
Post by: dbug on 20 February 2013, 00:56:50
May be worth pressure testing cooling system to locate leak - obviously it wasn't the hbv in this case  ::)

White smoke from exhaust is common on V6s this time of the year.

What year is your car - 1998??
Title: Re: misfire and oil in exhaust
Post by: djhorner on 20 February 2013, 02:33:05
yeah its a 98 mv6 3.0